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Now showing items 1-20 of 21

A phenomenological study on ferroelectric pyridinium tetrafluoroborate (C5NH6) BF4

Kiracı, Ali (Elsevier, 2019-10)

The temperature dependence of the specific heat C-V of (C5NH6)BF4 was analyzed according to a power law formula with a critical exponent alpha deduced from the compressible Ising model in the vicinity of the phase transition ...
A Thermodynamic Study On Pbzr0.52Ti0.48O3 Ceramic Close to the Tetragonal-Cubic Transition

Kiracı, Ali (Springer, 2020-05-01)

The isobaric Grüneisen parameter and the wavenumber (frequency) of various Raman modes in PbZr1-xTixO3 (PZT x = 0.48) ceramic were calculated by means of the unit cell volume of this crystal. In addition, the damping ...
Analysis of the Specific Heat and the Free Energy of [N(Ch 3 ) 4 ] 2 Znbr 4 Close to the Ferro-Paraelastic Phase Transition

Kiracı, Ali (Taylor&Francis LTD, 2019-02-04)

A power-law formula deduced from the Ising model was used to analyze the temperature dependence of the specific heat C p and the Gibbs free energy G of [N(CH 3 ) 4 ] 2 ZnBr 4 compound in the vicinity of the phase transition ...
Analysis of the specific heat and the free energy of [N(CH3)(4)](2)ZnBr4 close to the ferro-paraelastic phase transition

Kiracı, Ali (Taylor&Francis LTD, 2019-03-04)

A power-law formula deduced from the Ising model was used to analyze the temperature dependence of the specific heat and the Gibbs free energy of [N(CH3)(4)](2)ZnBr4 compound in the vicinity of the phase transition temperature ...
Calculation of the frequency shifts and damping constant for the Raman modes (A(1g), B-1) near the tetragonal-cubic transition in SrTiO3

Kiracı, Ali; Yurtseven, Hasan Hamit (Scientific Technical Research Council Turkey-Tubitak, 2017-01)

Raman shifts of the soft mode A(1g) and the B-1 mode are calculated at various pressures at room temperature for the cubic-tetragonal transition (P-c = 9.5 GPa) in SrTiO3. This calculation is performed using the observed ...
Calculation of the infrared frequencies as a function oftemperature using the volume data in the ferroelectric phase ofnano2

Yurtseven, H.; Kiracı, Ali (Taylor&Francis INC, 2014-02-17)

We calculate the temperature dependence of the infrared frequencies of the TO and LO modes with the symmetries of A(1), B-1 and B-2 mainly in the ferroelectric phase of NaNO2. This calculation is carried out using the ...
Calculation of the raman frequency, damping constant (Linewidth) and the relaxation time near the tetragonal-cubic transition in PbTiO3

Kiracı, Ali; Yurtseven, H. (Elsevier GMBH, 2017)

Frequencies, damping constants and the relaxation times of some Raman modes including the two soft modes are calculated as a function of pressure near the tetragonal-cubic transition in PbTiO3. Calculation of the Raman ...
Calculation of the raman frequency, damping constant (Linewidth) and the relaxation time near the tetragonal-cubic transition in PbTiO3

Kiracı, Ali; Yuetseven, Hamit (Elsevier GMBH, 2017)

Frequencies, damping constants and the relaxation times of some Raman modes including the two soft modes are calculated as a function of pressure near the tetragonal-cubic transition in PbTiO3. Calculation of the Raman ...
Damping Constant (Linewidth) and the Relaxation Time of the Brillouin LA Mode for the Ferroelectric-Paraelectric Transition in PbZr1-xTixO3

Yurtseven, Hamit; Kiracı, Ali (IEEE-INST Electrical Electronics Engineers INC, 2016-10)

The damping constant (linewidth) of the longitudinal acoustic (LA) mode is calculated as a function of temperature using the observed Brillouin frequencies of this mode from the literature for the ferroelectric-paraelectric ...
Damping constant and the relaxation time calculated for the lowest-frequency soft mode in the ferroelectric phase of Cd2Nb2O7

Kiracı, Ali; Yurtseven, H. (Elsevier GMBH, 2016)

The temperature dependence of the phonon frequency omega(ph) and of the damping constant Gamma(sp) due to pseudospin-phonon coupling of the lowest-frequency soft mode is calculated in the ferroelectric phase near the ...
Determination of trapping parameters of Tl2In2S3Se layered single crystal by thermoluminescence

Güler, İpek; Gasanly, Nizami (Wiley, 2018-04)

Thermoluminescence (TL) measurements are performed to evaluate the trap states in Tl2In2S3Se layered single crystals. TL experiments are conducted with varying temperature from 10 to 300 K and warming rates from 0.2 to 1.0 ...
Impaired redox homeostasis in the heart left ventricles of aged rats experiencing fast-developing severe hypobaric hypoxia

Ağaşcıoğlu, Eda; Çolak, Rıdvan; Demirel, Haydar; Çakatay, Ufuk (Springer, 2019-10)

Despite its rare occurrence, humans and animals have been prone to getting fast developing severe hypobaric hypoxia. Understanding the redox homeostasis related response of an aging heart to this type of hypoxia are crucially ...
Optical and photoelectrical properties of TlInSSe layered single crystals

Güler, İpek; Gasanly, N. (Elsevier GMBH, 2018)

Optical and electrical properties of TlInSSe layered single crystals have been studied by means of transmission, reflection and photoconductivity measurements. Transmission and reflection experiments have been carried out ...
Optical and structural characterization of silicon nitride thin films deposited by PECVD

Güler, İpek (Elsevier, 2019-07)

Plasma enhanced chemical vapor deposition (PECVD) technique was used to deposit silicon nitride (SiNx) thin films. The silane (SiH4) and ammonia (NH3) were used as reactant gases. Both the flow rates of the NH3 and SiH4 ...
Pressure dependence of the Raman frequency calculated from the volume data close to the ferroelectric-paraelectric transition in PbTiO3

Yurtseven, Hamit; Kiracı, Ali (Taylor&Francis, 2017)

We calculate the pressure dependence of the Raman frequencies of some Raman modes by using the observed volume data through the mode Gruneisen parameters for the ferroelectri-paraelectric transition in PbTiO3. The mode ...
Pressure-dependent Raman modes near the cubic-tetragonal transition in strontium titanate

Kiracı, Ali; Yurtseven, Hamit (Wiley, 2018-03)

The pressure dependence of the Raman frequency shifts of various Raman modes is calculated at room temperature using the volume data from the literature for the cubic-tetragonal transition in SrTiO3. The isothermal mode ...
Structural and Optical Properties of Ga2Se3 Crystals by Spectroscopic Ellipsometry

Güler, İpek; Işık, Mesut; Gasanly, Nizami Mamed; Gasanova, L. G.; Babayeva, Raziye (Springer, 2019-04)

Optical and crystalline structure properties of Ga2Se3 crystals were analyzed utilizing ellipsometry and x-ray diffraction (XRD) experiments, respectively. Components of the complex dielectric function (epsilon=epsilon(1)+i ...
Study of vibrational modes in (Ga2S3)(x) - (Ga2Se3)(1-x) mixed crystals by Raman and infrared reflection measurements

Erdemir, Işık Merda; Güler, İpek; Gasanly, Nizami Mamed (Elsevier, 2019-09)

Raman and infrared (IR) reflection characteristics were investigated in the frequency region of 100-450 cm(-1) for (Ga2S3)(x) - (Ga2Se3)(1-x) mixed crystals for compositions of x increasing from 0.0 to 1.0 by intervals of ...
Temperature and Excitation Intensity Tuned Photoluminescence In Ga0.75In0.25Se Crystals

Işık, M.; Güler, I.; Gasanlyc, N. M. (Elsevier Science BV, 2013-01)

Photoluminescence (PL) spectra of Ga0.75In0.25Se layered single crystals have been studied in the wavelength range of 580-670 nm and temperature range of 7-59 K. Two PL emission bands centered at 613 nm (2.02 eV, A-band) ...
Temperature dependence of the damping constant and the relaxation time close to the tetragonal-cubic phase transition in SrZrO3

Yurtseven, H.; Kiracı, Ali (Elsevier Science BV, 2017-01-15)

The damping constant Gamma(sp) due to the pseudospin-phonon coupling is calculated as a function of temperature using the pseudospin-phonon coupled model and the energy fluctuation model close to the tetragonal-cubic ...

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